our trucks allow for several series battery to go in...a 24 series, 25, and 26. 25 and 26 series are shorter while the 24 is longer. all three should fit, its your decision. if you want to get the same size you have right now.

as noted in another reply, any auto parts store should help you out.

if you want to op for a stronger battery go ahead, will come in handy in winter months; however, more amps more money.

Well morganology, since you're in LA and you don't have to deal with the bitter arse cold that kills batteries, I'd just go back with the stocker. Any parts store will be able to hook you up with minimal outlay.

Unless you have a huge stereo, a ton of lights, maybe a refrigerator in the back for those Anzo camping trips, then I'd just stick with the stocker. Otherwise, a nice yellowtop or dry cell (even a gell cell) will work nice for the larger draws.